[FLINK-13541][state-processor-api] State Processor Api sets the wrong key selector when writing savepoints

[sjwiesman]

What is the purpose of the change

The state processor api is setting the wrong key selector for its StreamConfig when writing savepoints. It uses two key selectors internally that happen to output the same value for integer keys but not in general.

Brief change log

• set the correct key selector

Verifying this change

UT

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? not applicable

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Automated Checks

Last check on commit 75ce1d9 (Tue Aug 06 15:56:36 UTC 2019)

Warnings:

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Review Progress

• ❓ 1. The [description] looks good.
• ❓ 2. There is [consensus] that the contribution should go into to Flink.
• ❗ 3. Needs [attention] from.
  • Needs attention by @tzulitai [PMC]
• ❓ 4. The change fits into the overall [architecture].
• ❓ 5. Overall code [quality] is good.

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[sjwiesman]

@flinkbot attention @tzulitai

[flinkbot]

CI report:

• 75ce1d9 : SUCCESS Build

[StephanEwen]

Thanks, @sjwiesman The fix looks good to me.

Rebasing and merging this...